Should I Retire?

Deciding when I should retire seems to be occupying a lot of my time these days.  I had decided at the beginning of the school year that this would be my last year.  I met with a counseling service representative from PERS (Public Employees' Retirement System) a few weeks back.  I received an estimate of my retirement salary and a percentage based on how many years I will have worked by the end of this school year.  It appears that if I retire on August 31, 2013, I will retire with 71.864% of my present yearly income. The cap is 75%.  So, if I work one more year, I will be at 74.5% which is as close as I can get to the 75% cap without going over.  The dilemma is whether I should go for that extra year.  It will mean $165 more a month until I am no more.  Can I face another year?  I wish I could look into a crystal ball and know the answer.  For now, I continue to ponder.  The paper work to retire is staggering.  Looking at it makes me think I don't want to fill it all out.  Maybe another year wouldn't be so bad.